The type or namespace 'NetworkTransport' could not be found...

I am copying over files directly from Unity's BossRoom example straight into my own project. I have installed the necessary Transport packages and have them up to date. For some reason my Unity.Netcode namespace is throwing the following error... it's working on the BossRoom side but not with my project!! Please help!
Images below:
1.) Full script
2.) Zoom in on error
3.) Packages installed
4.) NetworkTransport.cs script